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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f2ab139f629196ad383cd9f86fc92449b51d9559bd15c4f74c3d3f5dd2d1fc' 
  AND token = 'gc7UTNjgYmPOzQggwtL+r+1sKMTi7Z5EDI36fYDk518=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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