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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9511a931d551059e20ca6eb88fdc620fe57f4e84c25775031181a710a0a0461b' 
  AND token = 'hktoZBSSvNVK1j6lYHQuUdBGpt/Kdr6CqHyoKSScdu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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