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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c0660e1783679c7e693ed259a78c606a908ac0a33c0282201b658e634406be' 
  AND token = 'xEJFNAPfLOxcS80HBMSADOVNeCsvw4g+Ja1BCaUwqOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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