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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c25a78475e662dcdc2e7b79d7ac6a07dd9e02f1d2f0e57dfc5294fd0c4ac757' 
  AND token = 'FjfB/mH/snSV+kX1kBbQ4u66EBOJzM6pMFNX8feN4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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