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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59348c8c22c1a7cee3bf2241aa8c4be93596429a0747a7bea80565fe624390a9' 
  AND token = '/uMuHKRSOemX/GM2upIWsTXqo0szLSVAI5pCxBsCNL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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