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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e8b002175d163a29f159cc89125e8d83d7b1e70fdff0f9f1ae19b3bce46d06' 
  AND token = 'xFQHQp61smd+K9JBAdJcdJQO0OynyZfVOZ4ILapUfCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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