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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1addb0a2e64074f2c431022b19c5dc2f5daffa08f82b7e853dd870285b785684' 
  AND token = 'LCx6xpAaQOqt0lCQDJ/UJsDRbQFOjUSG4dVkZMVBmcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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