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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56afca4c22e8a88f24fcac62abc022c711e6a563b440513ca7ab9b4b510a39e' 
  AND token = 'tl8adan5slfLta5O7pgntVQYA28OfYseKSX+1LxRqEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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