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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7931b8718205162f86e82aa0831e00c14b1aa7f91ec1be7a6e292e937490411e' 
  AND token = 'vgGO8HKmmCc4L+U06HyhOR76K+uTVxb+sLyO/2FX9Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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