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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3b247274e0ecaa14289bd6b8b59619da70c9bc885ec38f4530b825db9f333a' 
  AND token = 'L3jXbs6AJIdcSlm2bUg337U8isdVNccn25cC+KM3+/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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