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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77d06d637e86e9f0ab44a9828547a3206966d9543cc687745425736e57e7d1e' 
  AND token = 'rY/a+6FLbz0HAoepT4SdLDY8QVNr9e1qwRDMVKhjVUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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