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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08973e31b85bf8d66f77b39dcce5a4e90f56bcfd770993dfdfb32d1f68d3ad5' 
  AND token = 'gnsLJ/TlLBzu1ZBX7xxS37zZ/yKQ/LEc7VSd7lj7Xqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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