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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039ef6dbba4a993be20ed83129a74ea7311101e8df27a7874c18e15771779ac4' 
  AND token = 'yo9JLx0xSthRIcPo/SPymFMSyZ+8dGmZy+ruQWNZr5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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