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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45451544f75eaf44af96563a9aed0774777de232ded0fb70b0b4da8d78ef6a6' 
  AND token = 'bne/YIUC5LLWRoeRO9lYOnFdr5fMrjUeyCcdSX631d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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