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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddace7d36b5ef1cf2f8dcd2547999a9e567593e0406849628aeb42c78d5d6c9' 
  AND token = 'T/wpC/cpldAkf2v/skONtvrKBZWiwhSMEVmZ3J9lhiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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