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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108d62a469952b5d4d48e57e321d25cfff6f62c0e6c30dcc9b97e1dd856c9a0e' 
  AND token = 'mZ64pRQPhfQK1yRmd3Ah3IrPP9AhHE+S5SOvHtRXQtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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