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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb42e03ffd7591da48a9c3abb5f6e1a2a56165fec74c9ca81a488157b5edc01' 
  AND token = 'Q5DfmRNuiwKP3pj72ientfAXacWl2w4ybyja3m8VXiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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