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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e3ee432c24bef3009e4b5a2c9a5935e376f7dbb0a58e8e63523358d3b6c564' 
  AND token = 'awOhbLHuQScm0Ambi0hSGQX9Dnv1fWGyVVXi/ho9O/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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