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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58beae07e4043b08d4158e2b8bcb48a9a493adaf9bad34ac8159a8e569904f41' 
  AND token = 'xR0d+hRpHB5NFdxqbrO/Lt3qtVcLY57fC2SyD2TXif0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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