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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112b0012866c11a80ad11732de0d207e6cbd83cb22f22bcca92651414a039f18' 
  AND token = 'oWXsF5SjMT1yGsivHygqwDplB/tj9qN7Uc8+Ldoq2bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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