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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e41e66a2e55a5609ed8b85ebbd368883f1789761330ba5802c97d93633baae' 
  AND token = 'VMklDKsIW8KhFUgDtYk1Tks4oAt8kgpncWddvT1MlBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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