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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf08e31dc140cbeb64986af77c88fda62cd0a8e12f4e6ce62d7e0989e106b9d' 
  AND token = '11h4D2gME1Ywq8csIeiG/qdB+dlKaVPE1puZcFZ02SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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