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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace975cf7ae4a9515c2d10bb2428af1c630f766f2fd09604fde78b779d40fddc' 
  AND token = 'rOEN1FvEascU6x6vREa9rdCdzdNCguIBNVUjnZy5byw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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