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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1625ad5a5b56137c663f42059fd78201ec8648bd83c8992be89e95765ca6bad' 
  AND token = 'Aq1QzOniyRnEu+dweu3vy6n8d6q7xxsAagFJ49sx3hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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