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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079cbfb1ff617f964176fe0ec2dd779617be663373b33c9d0b08d25351c11f08' 
  AND token = 't6HYdNeqNb+Zf/eMZ809tZyxHJzLhZUbwmmcP9lRpC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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