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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c692c1b3ee98a3c1afd77af3e24fd56b4b0fcf940516809e0da96d4e26197c1' 
  AND token = 'wyedSddP2SukuTQxnwraV8Cy5aBZMpALDyOz+C2SAvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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