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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac8afcb121695797d3fed154c21083d0e9c7ec142eba0ce6cdebea44bedb5d4' 
  AND token = 'iUz4jctGtyxWkLTWJwil51jQo7vJC7C7pz4KAC2iKoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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