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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec0020d34b6fdadb0f963a238dc0ec7509762eb6396b2d8104c8baa1a73977c' 
  AND token = 'm7rwnvTGvvd+19KN0GU8SVXzUCThxBIjeo+j8T19khY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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