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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0807d8ae78a65b85188f270623b7132d01b4d1f73b7585d4b96337cee07b5a51' 
  AND token = 'cPUAX0CHCxq9U9pHx0K+MSOwBWLyHayLlctpF6yBYbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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