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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d821c7b348fdb3e24185987a2ee0dc46444eb0578cb1b58cc29941fa4a7ece2' 
  AND token = '/jtiSpyEt5Xs4STY27Zz6TZkpy3EYkAiYz5EQsEIJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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