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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21fab3826a607167b80091e11961b7b10f101f3471009e692c100548f96c81e' 
  AND token = 'OzMrs0OrnkIHZEfKuVfL2IPxNFcIw4qUbGqyJ8ybAEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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