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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9236cf3e0fb9b04b738de0500dbf0301d4847ff713afb88a4bba9e692a022839' 
  AND token = 'gALYU87p03nr8b26U3P6OU0rfmnmfqoyzMtsgPxT924=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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