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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723cd499306f2e6b5dc91b24e879387e6712889beaf4bb875313b90052a6a3d' 
  AND token = 'lZHHU63n8s3V7upC7p1IEgMo8+E+r4/OSJRIRrMMiJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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