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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7ccd6620922e276028b8aa98d4174709f31bfb2d6bb52978c7dbcdea706da3' 
  AND token = 'u4EIRJVIWqqB5KoUmCg+xqMUlI4316jScKOWO22QATI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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