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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c9f7b8f2be5ceab11c013276412828c8481e54083e9eb8f628a0edd52cab5c' 
  AND token = '3/VyNYhQPCFAhwpwOpy1DXOaCm9HKzYq5UOK4dibTFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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