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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fe96a8c43fa633af9dabd585e9780f721bd8b234ecc27e81d177282e5a97b3' 
  AND token = 'dvU+obW13BWI6xE7gDc3gA9K+GlCuYuJdoCqEVdlDtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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