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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2a811640676362e06a4357f9fa887156455fe734bc0232c81689d6c9579a25' 
  AND token = 'cnU2c3TCr0KKk78f4ZUVjCjyGTcN0WSOJF9Fd6K7LEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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