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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4f768264a0ed72c4b5607e4d98e6950d56fc4798aeed670cd6a242a02d8b37' 
  AND token = '3+ELzMGQR4SGiGd8KU2o7+lkX2OOqeokIx0FrSd9ssY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}