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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62704594a658e6a48d234c05bb7ccc55991ff184bd4a9e3c330d14b8f3c9c0a' 
  AND token = '3EAPswb80hsmcPuu5ftRKNw94oGea4/5nlVsN2mFqyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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