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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39609f79b9ea52602d1e71e1bafa601e028c0179e47ffd9cbcff200e2622b47' 
  AND token = 'w9Yh3s0oCfSf63kXGeSflelwGND5KxkQa9JLHxGrH6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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