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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db255f4f9ce0704fdeeeff5d98e0fdecc815d4bfe371f855d7f37c4f4522f34b' 
  AND token = '1k/gHT+339RYQIzdnmV/T/qX1cvBBz3Bk0NMuc//58o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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