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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3209926e450b2425c850cecd7b058d1090c8e00db73a51e7dd9886f265789441' 
  AND token = 'iJNCI2lvLQQ0+ZbznM/4TKjATN3Q60AnWtmXKWqrCNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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