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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c8765be51b9888f2229399fae047044ed886b6b31c9ced644dcaae033c7c19' 
  AND token = 'VJmMawOz6NMsKDLY7CWw9ok3nEdmXpNPSNJ0VCGtRm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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