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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db1f8f996fac93f7747994bd15d211ccf757d432413133c360d6c410a00e5bf' 
  AND token = 'ZPiw7EwZjkpAFrQqhjdiEt4P39Zqb+6OZErG+B8mu+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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