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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b382cfc952e7e40cd2689b8f5c7cac4a2d4c1ff2189564abedef99c7e2d0773' 
  AND token = 'cuUqL5Gz978iQUdAR15kGyb7LjOYO1ayw1OilhCsY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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