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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe400494cf997657942949e2ceee438d3e435ef5e2f0a9363d36af9299cc9f1d' 
  AND token = '2tdRyu7lcLpNiQfC8dz2RGfPDyCTHjQQsIWB85qBr/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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