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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7dc6b2ba3d72ce144ed2b0fc52af5ebf2993429eec371c4b73e41d48322d37' 
  AND token = 'rZ1Bk8jwHvzOakqRzzpiDDaeXXp/Klf9wlPhclNtO6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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