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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899edd6e25acab4f2ba8302882d6c0f9b2caef6fdccdd13ae08e6d2e4867f7dd' 
  AND token = 'Gf4WJGIN59zMiWpu/KGs+edyhUm2Va3fKM7dSQ7C/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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