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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0042badeaf6254b77c820c22b0af14ffab446f30f5777113230abff4edaff3' 
  AND token = 'PO+VeUbu1YAYfXbLQ67zsG/GAnL90dn1PAuCFzwhOAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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