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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c11745ff537caac866c72460d7114a086f67a0b1aa6be99084dafc04adbadc' 
  AND token = 'AsRAvo18RxiXc6/vIjIDjFVo3aFBs6Dp0hJqit9C2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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