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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509f9ae920029f91875e1167ff3d29f5928744a906a0b32174a00bbb6cd8eb47' 
  AND token = 'tnw2qA8jBlp9w6rCcfGNclnANZkv+r3YWoEJPSNc8SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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