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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b2c6a7698c190019096038d9cb5029a0068da7576ed06b50f118a92362cbe2' 
  AND token = 'Ortrdts8WAbvsMKLXLZO6JSpVrbIKmsUb28J9AtgU2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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