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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d400ccba221d18f35fdc79aa8533ec42586b2dd94eed843c496fe5390ea944' 
  AND token = '1VUTQaOV9LE1nulkctbzN2fFxNAV3a2IoZQV2IsC4JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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