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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d3dba546bc2042e8a1605bce8574af3a2fac1aa428baf8f4b8d43f98dd9ffb' 
  AND token = 'gSqNj9zYPIKequSv0ZznEc3F1A7if5SNAJofzxLGHKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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