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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4e1ada23aa2771f5201716be2aa4386c37afd2ce85a3f722acdd24be5bbd05' 
  AND token = 'SbgH5tE9ogMqNGbG32pegBCHEViOMP7x2vUXo2seaOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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