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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b931ea811d1e0c72974f73a34bffbb18ab4ae06ab4d23f8f6aceaa3f54457' 
  AND token = '+bKYf0qcDATFDfgmTaed0dq2yiIJ2luqQW4d73ra/tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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